The AMPX system is a system of computer programs (modules) capable of producing coupled multigroup neutron-gamma-ray cross section sets. The system is one of the standards for producing multigroup neutron, gamma-ray production, gamma-ray interaction, and coupled neutron-gamma cross-section sets from ENDF data. AMPX-produced cross sections can be used directly with a variety of diffusion theory, discrete ordinates, and Monte Carlo radiation transport computer codes. A one-dimensional Sn calculation capability is provided for general use and for cross section collapsing. Treatments are included for resonance self-shielding effects.

The principal restriction is the availability of adequate core storage. All large modules are variably dimensioned. Certain modules will automatically use external storage (disk,tape), if in-core storage is inadequate. While these procedures are of little consequence on today's large computers with "virtual memory" capabilities, they can be important when small-core PC's or workstations are used.

NITAWL-II: Converts from the AMPX master library format to an AMPX working library. Optionally, it will perform a Nordheim integral treatment calculation for nuclides with resonance parameters.

RADE: Used to perform checks on AMPX master, AMPX working, and ANISN libraries.

ROLAIDS: Performs an integral transport calculation for the energy-pointwise, slowing-down flux distribution in each zone of a 1-D, multiregion geometry to produce multigroup resonance-shielded constants.

AMPX-77 is operable on the IBM 3090 and CRAY computers. In the latter case, the modules have been used in both the CRAY CTSS and UNICOS environments. Many modules have been used on UNIX-based workstations such as the IBM RISC 6000, the DEC 5000 and the HP.

AMPX-77 uses Fortran-77 and Assembler on the IBM system and Fortran-77 and some "C" on UNICOS systems. The IBM version was tested using the VS compiler (Level 2.2.0) and Assembler Level H running under OS/VS2. After processing with the conversion program included, the system was tested on a Cray under UNICOS using the CFT77 compiler. DISSPLA software is required for VASELINE.